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He also claims that many prisoners are crammed in cells and fed "toxic and horrible" food for dinner - which has allegedly left some of them unable to get an erection.

He adds: "This is like a place where you deposit human flesh, there's no rehabilitation."

We ask the serial killer about the rights of the victims whose lives he snatched away.

Looking frustrated, he replies: "I've heard that s*** my whole existence in prison - they say, 'oh you weren't worried about the victims'. Well I was f***ed up, bad. But isn't the point of putting me in prison so that I'll stop being a bad person? Or is it just punishment?"

He adds: "I think that the people outside like to have a person to kick. I'm a good person to kick because I'm a piece of s*** that went and killed a whole bunch of people."

Mirror Online obtained exclusive video footage and photos of Holbert, who was moved to the new prison along with hundreds of other convicts in late 2017.

"This is my roommate, Oscar... he lives in the floor," the killer says in one clip.

In the images, he can be seen working out, posing with wads of cash, preaching as his new Christian self 'Brother Bill', and grinning beside Panamanian inmates.

Holbert was moved to the newly-built Chiriqui Public Prison in 2017. Above, he shows off some of the cash he's made (Image: Mirrorpix)

He brags: "I think that in a way they [the Panamanian prisoners] see me as an anti-hero here because they hate gringos"

The murderer films himself barbecuing sausages in the prison's grounds (Image: Mirrorpix)

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"I think that in a way they [the Panamanian prisoners] see me as an anti-hero here because they hate gringos [foreigners], they hate them," he says.

"So even though I am one, they identify with me more as one of their own because of the fame that was gained in their country. It's a strange thing.

"I was famous here so I'm kind of like one of them. They've claimed me as theirs. Even people in the street are like, 'Wow, "Wild Bill", I wanna talk to him'.

"If I'd killed a whole bunch of Panamanians, I think I'd have had a big problem."

Holbert made headlines for his horrific crimes after he and his ex-wife were arrested.

In August 2017, he was locked up for 47 years for robbing and killing his victims, while his former spouse, Laura Reese, was jailed for 26 years for her role in the murders.

Today, he considers himself to be Panama's "most famous criminal of all time".

But despite smiling when asked about his self-declared notoriety, Holbert claims: "I'm humble... I hate being famous because it hasn't gained me a dollar. I haven't made a dollar off being famous and it's been a tremendous pain in the a*** in every aspect."

Holbert video-called us on a smuggled mobile phone that is shared among "premier" inmates at the prison (Image: Mirrorpix)

The killer considers himself to be Panama's "most famous criminal of all time" (Image: Mirrorpix)

He says prisoners can only use the toilet at set times - otherwise they have to "s*** in the shower" (Image: Mirrorpix)

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He recalls a time when he had to pick up capachos himself, moaning: "I was given an interior style dust pan, and a cheap garden rake, nothing else, and ordered to venture into the dangers of the green areas between the cellblocks to recover all the s***."

The killer, who says he's not yet ready to fully "talk about what I did", acknowledges that nobody will feel sorry for him because of his sickening crimes.

He says: "I'm not happy to be here - I don't want to be in prison obviously, but I think that it was very necessary in my life for me to grow as a person to be put in prison and to learn to take care of other people and not to be such a selfish a***hole."

He adds: "I don't think anybody's going to be crying because I went to prison. I'm looked on in the first-world very hated. I'm guilty as Hell, I'm guilty as sin."

But he boasts: "Here, I'm not hated.

"Within the Panamanian population, I think it's more like a novelty."

The killer says he's not yet ready to fully "talk about what I did" (Image: Mirrorpix)

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He was taken into custody on the border between Nicaragua and Costa Rica following a manhunt. At the time, prosecutors said the killer had confessed to the murders.

He allegedly admitted to killing his victims - Mike Brown, his wife and his teenage son, as well as Cheryl Lynn Hughes and Bo Icelar - as part of a sick plan to steal their property.

The convict - also nicknamed 'Savage Bill' - spoke to us using headphones and a smuggled mobile phone that is shared among "premier inmates" at the prison.

When asked whether he could kill again if he needed money, he claimed: "I need money right now. In this moment, there's no better place in the world for me to continue a criminal career and make lots of money than from where I am right now.

"And I'm not doing that."

In a statement to Mirror Online, Holbert's lawyer, Claudia Alvarado, said: "What I want as defence lawyer for the human rights of those deprived of freedom is that the Panamanian prisons are more humanised.

He says: "I just want a quiet life with my wife and to forget about being 'Wild Bill'" (Image: Mirrorpix)

"Better opportunities for resocialisation. Technical boards more inclined to work for the deprived and offer internal and external jobs which contribute towards the detained reinserting themselves into society upon release from prison and completion of their sentence.

"That they provide better quality food. Often it's not only good and new infrastructures, but those that have basic services like light and drinkable water."

She continued: "Good treatment of their families and to encourage cohabitation with them more often. That the deprived get to participate in extra-curricular courses and trades which will benefit them like electricity, plumbing etc.

"More humane personnel who are less inclined to criticise the detained. Promote courses to improve good habits and manners. The inclusion much more often of the church in prisons. Projects such as mechanics, cabinetmakingand others in the prison."

Ms Alvarado added that she also wants legal help for less wealthy inmates.